Packing and method of making same



May 31,A 1932. F. Bom-ONE PACKING AND METHOD OF MAKING SAME Filed July 8, 1929 TOR f/ Patented May. 31, 1932y j UNITED EEANx-EoRToNEoE JERSEY CITY, NEwfJEnsEY, AssIGNoEmo TEE nonrnconronal irroN, or JERSEY. 01mm NEW JERSEY, CORPORATION or ANEW JERSEY,

A .rAoxINGf'aNn METHOD vor,MAKING SAME., Y,

Appllcationjled"Julyh, 1929. Serial No.` 376,527?.

This invention relates to vpackings 'and more particularly to packings having definite contours and to the method of making the same. v 5 It 'has for an object the provision of packingsmoldedinany desired shape.l Anothenobject of this invention is to provideV a'fpackingf material of predetermined form,"including` means whereby itsshape maybe maintained handling thereofy permitted. ,Y Y

"A' further 'object of this kinvention colnfv prisesfpackings of y"predetermined shapesA havingcoverings thereon which are frangible and easily disrupted in. use ybut possess of. Y Y

Al specific object of this invention isv to provide packings f l'iavingI 4 predetermined, 2 shapes'coated Withcompositions includingy Y, n

' f ner and then `formed into thedesired form cellulose derivatives. 1

additional objectofthis invention kris d to provide methods for lproducingv packings Yabovesetv forthl Y 5 Other objects *will appear from'fthe folcompanying drawings in which:

Figure `lis across-section of a cylindrical packing forming yone part ofithis invention. Figurev `2 is a {cross-section Y of a hat or y lowing description, appended claimsand aestrip packingcomprising another'pa'rt of-` this invention.' l p n A VFigure V2 is a 'crossssection V01E a packing another modification of this invention.

Figure liis a tothis invention. Y y s.

'..Figure'iis ase'ctiona-l view of the'pre- {erred-apparatus usedin the manufacture of the packingsl illustrated in Figures 1 to 3 incluusive. n f Referring now to the drawings Whereinlike reference numerals designate 'likeparts, 'the' reference numeral 1 designates thepacking composition. This composition may be formed ofany desired ingredients It may f include anti-friction metallic chips, asbestosy fibers and/ or graphite, and any suitable bind-v er suchas oils,lvvaxes^, resins, or that described. and set forthin my copending application Sel suiicient Vstrength to permit handling there' having a' hemispherical shape! constituting s s s l 5 tained by forming the coatings of paints, pargasket produced according rial No. 376,852 of even date. By subjecting thiscomposition to a molding operation a packing Vof any predetermined form may be obtained. If a shaped packing, such as illustrated inFigures l and 2, is desired the plastic packing composition may be molded in any suitable mold or it may be extruded yunderV high pressure through a die having an aperture of the desiredshape: and size. In making the half-ring packing illustrated in Figure'3,each half may be individually moldedor the mass may be molded in semifcircular form and then cut to the desiredthickness.r These halfrings may be formed of packing havingany desired cross-section. On lthe other hand, if itis desired to make a packing in the form' of a gasket,as illustrated'in Figure 4, the composition may be introduced into arnold andthe product molded. fOr, the composi-A tion maybe first sheeted in any suitable mani by stamping.l i v When the packing composition is formed in various shapes, there may be atendency for a packing to. become distorted for ',fall e apart.V To overcome this, the molded packs.

ing is providedvvith a covering or coating 2 which possesses suiicient strength to permit handling, but is frangible and easily disrupted in use.l Preferably, the material forming the covering isv one Which does not abrade the moving parts. Various materials may bel used for forming this covering.` I have;

found that satisfactory results may be ob-k [such asnitrate, acetate, ether, etc. vvith.- or

Without plasticizers; natural or articial res`- insdissolvedl in `volatile solventsor formed into ,plastic compounds plastic compositions or solutions in solvents, yvolatilesor otherwise, of gelatin, gums, waxesfetc. If desired, the extruded Vmass may ybe braided with artilicialk silk produced from viscose, cuprammonium cellulose', denitrated cellulose nitrate, or cellu lose acetate. 5 The extruded` mass ralso may be Wrapped with variousmaterials, suche-as precoatings permitted or caused to set. Instead" of immersing definite'lengths of the material in a bath, the extruded mass, as it is ejected from the die, may be caused to issue into a bathof the coating material from which it may be withdrawn and whereby it will be suitably coated. In cases where the immersion of the packing is not practical, the packing as it isextruded from the die may be passed throughy a coating mechanism comprising a plurality of spray mechanisms whereby it may be coated.

In cases wherea plastic composition is toy be used for forming the coating or covering, various methods may be used. The molded packing may be coated with the plasticl coatlng composition and then again extruded, whereby the coating is made to conform to the shape of the packing. The coveringmay also be formed simultaneously with the extrusion of ythe packing. To carry outthe last-named method the.y apparatus illustrated in Figure 5 may be used. This apparatus comprises av removable die 10. At the inner end thereof it is formed with ar4 gate 11 through which the composition is forced into the die. The gate 11 registers with a passage 12 extending through the die. VAt the outer end thereof the passage 12 is formedslightly larger in size than the remainder of said passage as indicated at 13. Adjacent the enlarged portion y13 there isy an annular distributinV l chamber 14 and communicating therewit .isy a plurality of channels 15 through which the plastic composition adapted to form the coating may be supplied. Thus, in carrying out this method the packj ing composition is forced under pressure into.

After the the gate and ythrough the die. packing has been shaped and prior to or si-A multaneously with the entrance thereof into the enlarged kpassage 13, it is enveloped or surrounded with the plastic coating composition introduced through ther channels 15.

f Continuation of the extruding process forms the coating composition and makes it conform to the shape of the packing. Y

The shapedpackings produced as abovedescribed comprise molded materials of detinite shape and size having casings, coverings or coatings which permit handling thereof.

The packing, ifin the form illustrated in Figures 1 and 2, is wrapped one or more times around the shaft and forced into the box or gland by any suitable tool or by the follower. If the half-ring type is used, two sections or multiples thereof are disposed around the shaft and forced into the gland as abovedescribed. In use, the covering is substantially immediatel broken and disrupted whereby the pac ing composition is permitted to function. Since the covering is made of a non-abrasive material, the moving yparts are not injured or damaged thereby.

Since it is obvious that various changes Vmay be madein the specific details above- 3. A method ofy making packings of pre-y determined shapes which comprises extruding a packing composition through a die, applying theretoa composition containing a cellulose derivative to form a coating, and permitting said coating to set.

4. A methodofmaking packingsof predetermined shapesy which comprises extruding a packing composition through a die, plying thereto a compositionincluding c e lulosenitrate toy form a coating, and allowing said coating to set. f

5. A method of making packings of predetermined shapes which comprises extruding a packing composition and applying a composition containing aA cellulose derivative to thek shaped packing to form a coating prior to the exit of the packing from the die.

6. A packing comprising a packing comsition havinga covering, saidcovermg bemg frangible and easily disrupted in use and possessing suiiicient strength to permit handling, said packing having adefinite shape and form. .n p f 7. A packing comprising a molded composition having a covering of a non-abrasive -maierial, said covering' being frangible and easily disrupted in use and possesslng sufficient strength to permit handling.

8. A packing comprising a die-extruded kcomposition having a covering lof a nonabrasive material, said covering being frangi-y ble and easily kdisrupted in use and ossessing sufficient strength to permit han ling.

9. `,A packing comprising a coated molded composition, the coating being frangible and easily disrupted in use andA possessing suicient strength to permit handling.

l0. A packing comprising a molded 00mposition having a coatingoomprising a cellulose derivative. y n

11. A packing `comprising ya molded comf position having a coating comprising vcellulose nitrate..

In testimony whereof, I have affixed my signature to this specication.

FRANK BORTONE 

